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A theory is presented for the universal reduction of shot noise by Coulombrepulsion, which was observed in computer simulations of a disorderednon-degenerate electron gas by Gonzalez et al. (cond-mat/9803372). Theuniversality of the reduction below the uncorrelated value is explained as afeature of the high-voltage regime of space-charge limited conduction. Thereduction factor depends on the dimensionality d of the density of states,being close but not quite equal to 1/d in two and three dimensions.Comment: revised in response to referee reports; 3 pages, no figure

Sub-Poissonian Shot Noise in Nondegenerate Diffusive Conductors